They are angled to direct air up into the engine compartment to keep the under-hood temps down, as well as lowering the engine temperature..

Made of HDPE (high-density polyethylene), and all seams hot nitrogen thermal welded, they are extremely strong. HDPE has very good UV protection and is flexible in most weather conditions. The factory hole pattern allows some room to play. The prototype was installed on three different cars before the final release. The air dam is 3/16" thick and CNC-cut for accuracy. They are available with or without the "Impala SS" logo. The vinyl graphics are added on last.

Take a look at the many options to choose from: